This site is a static rendering of the Trac instance that was used by R7RS-WG1 for its work on R7RS-small (PDF), which was ratified in 2013. For more information, see Home.
WG1 voted to require three procedures: write detects cycles but not necessarily shared structure, write-shared detects both, and write-simple detects neither.
WG1 voted to require three procedures: write detects cycles but not necessarily shared structure, write-shared detects both, and write-simple detects neither.